Readers ask: What Is Active Performance Exhaust Harley Davidson Motorcycles?

What is active exhaust on a Harley?

The active exhaust system utilizes an actuator valve located in the rear exhaust pipe which is connected to a servo motor via a cable. The valve position automatically adjusts to enhance engine performance.

Why do Harleys engines sound different?

The 45° design of the engine thus creates a plug firing sequencing as such: The first cylinder fires, the second (rear) cylinder fires 315° later, then there is a 405° gap until the first cylinder fires again, giving the engine its unique sound.

Should I tune my Harley after exhaust?

Stock motorcycles do not need to be tuned directly from the showroom floor. Once you make changes to the air filter system, muffler and or exhaust headers your bike will most likely will need to be tuned.

Are Harley exhausts legal?

No. The sale and installation of an aftermarket exhaust system remains legal in California so long as it does not exceed a sound level of 95-decibels when tested under SAE J1492 and complies with all other exhaust and safety laws and regulations.

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What is Eitms on a Harley?

For those riders who frequently find themselves in riding conditions where the vehicle is subjected to prolonged idle conditions or traffic congestion, the motorcycle is equipped with an Engine Idle Temperature Management System (EITMS) to provide limited cooling of the rear cylinder.

What does an exhaust butterfly valve do?

What are exhaust butterfly valves? Exhaust butterfly valves are a type of actuator used to silence or reduce noise emitted from certain applications. These valves are commonly associated within the automotive industry, as they will often be found working within cars or motorbikes.

Why do Harleys make so little power?

Cruisers have high torque, low powered engines As a result of the styling and design of the bikes, there is less airflow into the engine and less heat dissipation to cool it. Since the engines cannot rev very high, they compensate with size. The new Harley Milwaukee Eight 114 is 1 868 cc.

Do both cylinders fire at the same time on a Harley?

The pins are 180 degrees apart from one another. A Harley engine has two pistons. The difference in the Harley engine is that the crankshaft has only one pin, and both pistons connect to it. This design, combined with the V arrangement of the cylinders, means that the pistons cannot fire at even intervals.

Why are Harleys so expensive?

Harley-Davidson motorcycles are expensive because it’s a premium brand, it has increased its quality since the 1970s by reducing the number of suppliers and implementing strict standards and also because manufacturing and assembly takes place in a country where the demand for labour is higher.

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Do I need to Rejet motorcycle after installing new exhaust?

If you’re just swapping the exhaust with a new one of the same type, there’s probably no need to rejet your carburetor at all. Where it becomes an issue is when you are installing a stronger or tuned exhaust. Doing so raises the running temperature of your engine and more fuel is needed to compensate.

Do slip-ons require remap?

You don’t have to do any changes to motorcycle when installing a slip-on. When reducing exhaust back pressure, you should consider what it does to the air/fuel mixture. Remapping is required if you want the most performance and smoothest power delivery from your bike.

Is dyno tuning a motorcycle worth it?

TLDR – Dyno tuning your motorcycle is definitely worth the money if you already have performance mods like performance exhaust and air filters installed. With those mods, tuning could add an additional 5 or so horsepower – which is significant.

Is it legal to straight pipe a motorcycle?

But in most areas, straight piping is illegal. Both the noise and emission is too much for street use. Decreased horsepower. Without tuning, straight piping makes your engine run lean and cause you to lose horsepower.

Why are downpipes illegal?

It bypasses the the catalytic converter that’s what makes it illegal. That’s also the whole point of a test pipe, so if you want to stay legal you need to just get a high-flow cat instead.

Are Catback exhausts legal?

Catback exhaust systems are completely legal in the State of California because the modification starts after the catalytic converter and does not affect any of the emissions control components of your vehicle.

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